I have a lot of doubts regarding the real meaning of this defeat, with issues such as:
i) was purely a military defeat or the willingness of the French officials to surrender quickly was also an important factor ii) why nobody anticipated; both from the British and for the Soviets that expected a much stronger resistance
French officials didn't surrender quickly, don't take your knowledge from memes.
The Germans overran them, with their offensive through the Ardennes Forrest, which was thought to be nearly impossible terrain to march through they surprised the allied armies and divided them. While they attacked the Maginot Line from the front they were able to pin the allied forces and come from behind and surround them. Since the French and the Allied forces had most of their well-equipped armies on the Maginot Line the conquest of France was "easy". The battle of Dunkirk was a deciding factor as well. After that, the tables had turned, before the Allys had a bigger and better-equipped army, but huge chunks were pinned at the Maginot Line and the rest was defeated at Dunkirk(or, to be more precise, at the offensive to Dunkirk). In the " Trap of Lothringen" the Germans were able to surround the last armies of the allies at the Maginot Line and defeat them.
The westoffensive (which includes the conquest of Belgium, Luxembourg and the Netherlands) started on March 10, 1940, and ended on June 25, 1940, with the french-italian truce.
So to say: the French made the mistake to be too defensive in the war. They surely didn't surrender easily, they were just overrun.
To your second question:
Yes, Stalin hoped for more resistance, but that was because he wanted both capitalistic states to weaken each other and he appealed to all communists in both nations to sabotage the war effort. The French people didn't really want to go to war and their morale was low, which the French government said was the communist's fault and they even claimed that they sabotaged the war effort, though there is nothing like that proven anywhere.
The French didn't fight alone in that offensive, the British expedition core was a huge part, the Canadians had troops there as well and the resistance was not weak, it was just overrun. After the offensive, when France was occupied the french resistance was huge and vital. Without them, it wouldn't have been possible to fight and defeat the Germans in France. Their reconnaissance and fight were detrimental to the victory of the allied forces.
I hope that answers your questions somewhat, I'm not 100% sure what you really meant.
Keep in mind, what I wrote is just a broad summary and I left some things out, for example, the whole offensive against Belgium and the Netherlands. But you asked about the French.